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It Sounds To Me Like....

Posted by Dodgeman on June 11th, 2001 02:02 PM
In reply to sump pump that goes thump, thump by d horswill on June 10th, 2001 09:52 PM [Go to top of thread]

You have a check valve in the discharge line of your pump, and what you are hearing is watter hammer from the sudden stop of water in the discharge line fallin back on the check valve.
A larger diameter discharge line will slow the water velocity and minimize this.

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